CN103624377A - Welding forming method of box-type support element panels - Google Patents
Welding forming method of box-type support element panels Download PDFInfo
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- CN103624377A CN103624377A CN201310703257.9A CN201310703257A CN103624377A CN 103624377 A CN103624377 A CN 103624377A CN 201310703257 A CN201310703257 A CN 201310703257A CN 103624377 A CN103624377 A CN 103624377A
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- welding
- panel
- groove
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- support member
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
- B23K2101/185—Tailored blanks
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a welding forming method of box-type support element panels, and the method has the characteristic of alleviating welding deformation. The welding forming method of the box-type support element panels comprises the following steps: a. grinding the bonding regions, on which ceramic gaskets are required to be bonded, of the panels and vertical plates, clearing impurities on the bonding regions, and then sintering the bonding regions for removing water vapor; b. bonding the ceramic gaskets on the vertical plates; c. covering the upper surfaces of the ceramic gaskets with the panels, wherein single-surface-welding dual-surface-forming welding grooves are formed between the panels and the vertical plates, the upper parts of the grooves are single-surface U-shaped grooves, the lower parts of the grooves are single-surface V-shaped grooves, the angle alpha of each single-surface V-shaped groove is equal to 30 degrees, the clearance a between the truncated edge of each groove and the corresponding vertical plate is more than or equal to 6mm and less than or equal to 8mm, and the size h of the truncated edge of each groove is more than or equal to 2mm and less than or equal to 3mm; d. preheating the panels and the vertical plates; and e. performing flux-cored wire gas shielded welding on the panels and the vertical plates at the grooves. The shrinkage deformation during welding can be controlled effectively.
Description
Technical field
The present invention relates to a kind of welding method, be specifically related to a kind ofly when welding box-shaped support member, can effectively control the box support member panel panel welding shaping method of box support member inner space distance.
Background technology
Three/Haiyang Nuclear Power Station Process for Heavy Support belongs to third generation AP1000 nuclear power support member, is that head overlaps generation Ⅲ nuclear power support member in the world, and it makes a big difference with nuclear power support member in the past, without any experience, can use for reference.This supporting structure is box-structure, and concrete structure as shown in Figures 1 and 2.
This support member mainly has following difficulty in process of production:
1, this product size required precision is high, for welding deformation, require very harsh, and whole supporting piece structure is unfavorable for controlling distortion, the difficulty of controlling distortion in welding process is very big, distance between this product requirement panel 1 and workpiece 8 is 54mm, but due to the distortion in welding process, bulk between General Requirements panel 1 and workpiece 8 poor at 2mm with interior, size between 52mm～56mm, be qualified.
2, all weld seams of this product all require to carry out ultrasonic examination, for box-structure, inner space is very little, as shown in Figure 2, the space of the panel 1 of just, carrying on the back after welding equipment and between inner workpiece 8 be 54mm only, cannot realize back gouging and welding, can only select to adopt single face welding and double face shaping welding method, guarantee that the difficulty of weldquality is very big.
3, this Project Product requires to carry out 100%MT flaw detection after weld seam bottoming, because the welding stress of closed weld is larger, easily produces root cracking.
4, Present Domestic is also immature for the manufacturing process technology of this project, can run into aborning a lot of provisional bursting problem.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of box support member panel welding shaping method that reduces welding deformation amount.
The technical solution adopted for the present invention to solve the technical problems is: box support member panel welding shaping method, comprises the following steps:
On a, counter plate and riser, need the bonded areas of pasted with ceramic veneer liner to polish, remove the impurity of bonded areas, then bonded areas is dried to burning, remove steam;
B, ceramic substrate bonds on riser;
C, at ceramic substrate upper surface, mount cover panel, groove between described panel and riser is single face welding and double face shaping bevel for welding, and the top of groove is the U-shaped groove of one side, bottom is one side double V-groove, these one side double V-groove angle [alpha]=30 °, between root face and riser, gap is a, 6mm≤a≤8mm, root face is of a size of h, 2mm≤h≤3mm.
D, preheating panel and riser;
E, employing flux-cored arc welding weld, and panel and riser are welded as a whole at groove place.
Further, after step c, before steps d, between the upper surface of panel and the upper surface of riser, weld lacing wire, after step e completes, remove this lacing wire.
Further, after step b, before step c, at the lower surface of ceramic substrate, be provided with support member.
Further, in step e, adopt the welding method of backstep to weld, and the starting the arc of welding point is on the weld seam of the preceding paragraph; In the process of welding prime coat, the thickness of described prime coat is H, 7mm≤H≤8mm.
Further, in the welding process of step e, welding parameter is chosen for electric current 180-200A, voltage 30-31V, speed 18-20cm/min, gas flow 18-20L/min.
The invention has the beneficial effects as follows: by controlling structure and the size of bevel for welding, can effectively avoid groove root to produce the defects such as lack of penetration, can also reduce welding loading, be conducive to control welding contraction distortion, can be effectively controlled in 2mm the bulk between panel and workpiece is poor, be particluarly suitable for applying in the higher box support member panel welding job of inner space required precision.
Accompanying drawing explanation
Fig. 1 is the structural representation of nuclear power support member in background technology of the present invention;
Fig. 2 is the cutaway view of A-A direction in Fig. 1;
Fig. 3 is the structural representation in panel welding process;
Fig. 4 is the local structure for amplifying schematic diagram at I place in Fig. 3.
In figure, be labeled as: panel 1, riser 2, ceramic substrate 3, groove 4, lacing wire 5, support member 6, prime coat 7, workpiece 8.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
As shown in Figure 1 to Figure 3, box support member panel welding shaping method of the present invention, comprises the following steps:
On a, counter plate 1 and riser 2, need the bonded areas of pasted with ceramic veneer liner 3 to polish, remove the impurity of bonded areas, then bonded areas is dried to burning, remove steam; The removal of the polishing in this step, impurity and steam is mainly in order ceramic substrate 3 to be close in step b and step c in the bonded areas of panel 1 and riser 2.
B, ceramic substrate 3 bonds on riser 2; The effect of ceramic substrate 3 is after welding completes, and makes the bead formed on back of groove 4 attractive in appearance, avoids the back side root of weld seam to produce incomplete fusion and lack of penetration and so on defect.
C, at ceramic substrate 3 upper surfaces, mount cover panel 1, groove 4 between described panel 1 and riser 2 is single face welding and double face shaping bevel for welding, and the top of groove 4 is the U-shaped groove of one side, bottom is one side double V-groove, these one side double V-groove angle [alpha]=30 °, between root face and riser 2, gap is a, 6mm≤a≤8mm, root face is of a size of h, 2mm≤h≤3mm.To guarantee that the root of weld has enough operating spaces on the one hand, avoid groove root to produce the defects such as lack of penetration, reduced on the other hand welding loading, be conducive to control welding contraction distortion, can be effectively controlled in 2mm the bulk between panel 1 and workpiece 8 is poor, the size being about between panel 1 and workpiece 8 is effectively controlled between 52mm～56mm.
D, preheating panel 1 and riser 2; The object of this step preheating is: one, and pre-heat energy slows down the cooling velocity of postwelding, is conducive to reduce the degree of hardening of weld zone and heat affected area, has improved the crack resistance of welding point; Its two, preheating can reduce welding stress, can reduce the temperature difference between welding region welded piece, like this, has on the one hand reduced welding stress, on the other hand, has reduced weld strain speed, is conducive to avoid producing weld crack; Its three, preheating can reduce welded constraint (restraint) degree, particularly evident to reducing the constraint (restraint) degree of corner joint, along with the raising of preheat temperature, cracking frequency declines.
E, employing flux-cored arc welding weld, and panel 1 and riser 2 are welded as a whole at groove 4 places.Flux-cored arc welding is that from the difference of solid welding wire protection weldering welding wire internal structure is different, and solder flux or metal powder mixture are housed in the welding wire of flux-cored arc welding.Adopt flux-cored arc welding can make appearance of weld more attractive in appearance, and in welding process, generation is splashed little, is beneficial to cleaning, be also difficult for producing the defects such as undercut, crackle, pore.
Embodiment:
By above-mentioned a, b, c, d, e five steps, weld, wherein, in step c, groove 4 is single face welding and double face shaping bevel for welding, and the top of groove 4 is the U-shaped groove of one side, and bottom is one side double V-groove, and other parameter is selected as shown in the table:
From seven embodiment of upper table, can find out: in embodiment 1 to embodiment 4, when one side double V-groove angle [alpha]=30 °, between root face and riser 2, gap is a, 6mm≤a≤8mm, root face is of a size of h, during 2mm≤h≤3mm, there is not lack of penetration phenomenon in groove root, and can also be effectively by poor being controlled in 2mm of bulk between panel 1 and workpiece 8.And in embodiment 5 to embodiment 7, groove root has not soldering tip phenomenon, and the bulk between panel 1 and workpiece 8 is poor can not effectively be controlled at 2mm within.
In the above-described embodiment, while welding in groove 4, because the weld seam between panel 1 and riser 2 is longer, may cause in welding process, gap a between root face and riser 2 changes, and will be unfavorable for the moulding of weld seam, therefore, as preferred embodiment, after step c, before steps d, between the upper surface of panel 1 and the upper surface of riser 2, weld lacing wire 5, after step e completes, remove this lacing wire 5.By the setting of lacing wire 5, the relative position relation between panel 1 and riser 2 can be fixed, thereby while avoiding welding in groove 4, cause the gap a between root face and riser 2 to change, thereby can improve the molding effect of weld seam.
In order to prevent that in welding process, ceramic substrate 3 comes off, as preferred embodiment, after step b, before step c, at the lower surface of ceramic substrate 3, be provided with support member 6.Like this, by 6 pairs of ceramic substrates 3 of support member, effectively support, can prevent that ceramic substrate 3 from coming off, thereby can effectively guarantee the molding effect of back of weld.
In the above embodiment, can from a certain position starting the arc of weld seam, sequentially weld by the length direction along weld seam, but which easily forms welding stress and concentrates, therefore, as preferred embodiment, in step e, adopt the welding method of backstep to weld, and the starting the arc of welding point is on the weld seam of the preceding paragraph; In the process of welding prime coat 7, the thickness of described prime coat 7 is H, 7mm≤H≤8mm.Backstep is about to weld seam and is divided into multistage, and then the method for each section of weld seam is welded at interval, and it has can reduce heat affected area, avoids the advantage of distortion, therefore, can control well welding stress and concentrate.And by backstep and by the starting the arc of welding point on the weld seam of the preceding paragraph, can effectively avoid the generation of crater crack.In addition, by the mode of backstep and the thickness of prime coat 7 is arranged on to 7mm≤H≤8mm, can effectively prevent root cracking, by choosing respectively the thickness of prime coat 7, be that 7mm, 7.5mm and 8mm test, and adopt the method for backstep, by carrying out flaw detection, do not find that there is the phenomenon of root cracking.In addition, on the basis of present embodiment, operating personnel are when operation, preferably swing welding, amplitude of fluctuation can not be too large, when electric arc will be done the local reciprocating motion along fusion length direction during in riser 2 one side, when groove one side, electric arc is stopping a little after root face fusing, guarantee that the groove back side, without undercut, guarantees that electric arc is all the time at 1/3 place in molten bath simultaneously, control molten iron and do not flow to the place ahead, molten bath, avoid the incomplete fusion phenomenon of root postwelding, will prevent in addition that bath temperature is too high burns ceramic substrate 3 and forms overlap.
For similar box support member in the present invention, after General Requirements appearance of weld, the tensile strength >=450MPa of welding line joint, low temperature (18 ℃) impact value >=34J, low temperature (18 ℃) lateral expansion >=0.64mm.Therefore, in order to control the performance of weld seam inside, in the welding process of step e, welding parameter is chosen for electric current 180-200A, voltage 30-31V, speed 18-20cm/min, gas flow 18-20L/min.By the parameter area at electric current, voltage, speed, gas flow, choose respectively a plurality of values and carry out many group tests, the tensile strength that obtains welding line joint all can reach 565MPa left and right, much larger than 450MPa, low temperature (18 ℃) impact value reaches 117J left and right, much larger than 34J, low temperature (18 ℃) lateral expansion can reach 1.9mm left and right, also much larger than 0.64mm.Therefore, when welding parameter is chosen for electric current 180-200A, voltage 30-31V, speed 18-20cm/min, during gas flow 18-20L/min, can obtain qualified weldquality.
Claims (5)
1. box support member panel welding shaping method, is characterized in that comprising the following steps:
On a, counter plate (1) and riser (2), need the bonded areas of pasted with ceramic veneer liner (3) to polish, remove the impurity of bonded areas, then bonded areas is dried to burning, remove steam;
B, at the upper bonding of riser (2) ceramic substrate (3);
C, at ceramic substrate (3) upper surface, mount cover panel (1), groove (4) between described panel (1) and riser (2) is single face welding and double face shaping bevel for welding, and the top of groove (4) is the U-shaped groove of one side, bottom is one side double V-groove, these one side double V-groove angle [alpha]=30 °, between root face and riser (2), gap is a, 6mm≤a≤8mm, root face is of a size of h, 2mm≤h≤3mm;
D, preheating panel (1) and riser (2);
E, employing flux-cored arc welding weld, and panel 1 and riser 2 are welded as a whole at groove 4 places.
2. box support member panel welding shaping method as claimed in claim 1, it is characterized in that: after step c, before steps d, between the upper surface of panel (1) and the upper surface of riser (2), weld lacing wire (5), after step e completes, remove this lacing wire (5).
3. box support member panel welding shaping method as claimed in claim 1, is characterized in that: after step b, before step c, at the lower surface of ceramic substrate (3), be provided with support member (6).
4. box support member panel welding shaping method as claimed in claim 1, is characterized in that: in step e, adopt the welding method of backstep to weld, and the starting the arc of welding point is on the weld seam of the preceding paragraph; In the process of welding prime coat (7), the thickness of described prime coat (7) is H, 7mm≤H≤8mm.
5. according to the box support member panel welding shaping method described in any one claim in claim 1 to 4, it is characterized in that: in the welding process of step e, welding parameter is chosen for electric current 180-200A, voltage 30-31V, speed 18-20cm/min, gas flow 18-20L/min.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105081520A (en) * | 2015-06-11 | 2015-11-25 | 上海船舶工艺研究所 | Full-automatic 9% Ni steel medium-thin plate vertical butt joint FCAW one-side welding and double-side molding technological method |
| CN106001866A (en) * | 2016-07-11 | 2016-10-12 | 上海航天设备制造总厂 | Welding deformation control method of large thick-wall box body component |
| CN106112224A (en) * | 2016-07-21 | 2016-11-16 | 武汉天高熔接股份有限公司 | Steel construction U-shaped floor angle welding full penetration technique |
| CN109208409A (en) * | 2017-06-30 | 2019-01-15 | 比亚迪股份有限公司 | Riding-type Monorail Switch beam and preparation method thereof |
| CN110883407A (en) * | 2019-10-24 | 2020-03-17 | 上海江南长兴造船有限责任公司 | Method for solving welding joint defects in production |
| CN113977037A (en) * | 2021-12-07 | 2022-01-28 | 上海电气核电设备有限公司 | Single-side welding and double-side forming method for T-shaped joint of closed supporting structure |
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| CN113977037A (en) * | 2021-12-07 | 2022-01-28 | 上海电气核电设备有限公司 | Single-side welding and double-side forming method for T-shaped joint of closed supporting structure |
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Effective date of registration: 20180315 Address after: 618013 Deyang Pearl River West Road, Sichuan, No. 460 Patentee after: Double (Deyang) heavy equipment Co., Ltd. Address before: 618013 Deyang Pearl River West Road, Sichuan, No. 460 Patentee before: Erzhong Group (Deyang) Heavy Equipment Co., Ltd. |